|Publication number||US8035635 B2|
|Application number||US 10/152,066|
|Publication date||Oct 11, 2011|
|Filing date||May 22, 2002|
|Priority date||May 22, 2001|
|Also published as||CN1322473C, CN1529875A, EP1399890A1, EP1399890B1, EP2309461A1, US9396578, US20020176636, US20120007862, US20150187121, WO2002095685A1|
|Publication number||10152066, 152066, US 8035635 B2, US 8035635B2, US-B2-8035635, US8035635 B2, US8035635B2|
|Original Assignee||Yoav Shefi|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (29), Non-Patent Citations (6), Referenced by (13), Classifications (20), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims the benefit of U.S. Provisional Application 60/293,370 filed May 22, 2001.
This invention relates to methods for displaying visual content on a screen.
Computer screens and other two-dimensional (2D) surfaces are commonly used for displaying 2D visual content such as a page of text, a diagram or a Web site page. Some forms of visual content contain two or more content forms, such as a page consisting of text and diagrams, or a Web site page containing information related to the site and unrelated advertising. Usually, only one page is displayed on a screen at a time and the page is confined to the boundaries of the screen. The different elements in a page must therefore compete with each other for space and the viewer's attention, even if they are related to each other Existing Web site pages are therefore generally overcrowded by advertising and this is the major reason why Web advertising is presently considered ineffective.
Changing a displayed page (known as browsing or navigating) is a discontinuous process wherein an initially displayed page is removed from the screen and a second page is subsequently displayed. The ability to view only one page at a time makes it difficult for a viewer to know his location at a website and also creates uncertainty while navigating through the site. Changes in the size of a page is also done in discrete steps, and a return to the browser is required for each step change.
It is also known to arrange several pages in a virtual three-dimensional (3D) space and projecting a portion of the 3D space onto the 2D screen. A viewer may continuously navigate from page to page.
Robertson et al (Data Mountain: using Spatial memory for document Management) disclose a method for document management which allows users to place documents at arbitrary positions on an inclined plane in a 3D desktop virtual environment using a 2D interaction technique. The pages are all viewed en face perpendicular to the user's perspective). Robertson et al (Task Gallery: a 3D Window Manager) disclose a method for task management and document comparison. Application windows appear unaltered as artwork hung on the walls of a virtual art gallery, with a selected task on a back wall. The perspective from which the gallery is viewed is perpendicular to the back wall of the gallery, so that documents hung on the back wall are viewed en face, while documents on the side walls, floor and ceiling are parallel to the user's perspective. Multiple documents can be selected and displayed side-by side using 3D space to provide uniform and scaling.
As used herein the term “page” refers to a two-dimensional array of two or more visual “content elements”. A page is typically, although not necessarily, rectangular in shape. A page has a top edge, a bottom edge and left and right side edges. A content element may be 2D (such as text, a diagram, or a 2D picture including 2D pictures of 3D objects such as a mountain). A visual content element may also be volumetric 3D (such as a virtual mountain). A volumetric 3D content element projects volumetrically out of the page. The content elements in a page may be of the same or of different type, such as a page consisting of textual material, a diagram and volumetric 3D figure. In the case of a page containing text, the text is normally read from the top edge to the bottom edge. A page has an associated “layout” that specifics the relative position of the different content elements in the page. For example, the layout may specify that a particular content element in a page is located at the top of the page, or is located to the left of another specific content element. The term “document” refers to a collection of one or more pages. A document may be, for example, pages of textual material, web site pages, a directory, operating system folders, search query results, Adobe™ or PDF elements, their content elements, bitmap images, buttons, etc. A document page may thus be, for example, a page of textual material, a website page, or a window. A window is a specialized page designed to contain as a content element a view of another page. An application interface window is a window containing, in addition to a view of another page, a layout of content elements each representing one or more of the application functions, or a link to another window.
In its first aspect, the present invention provides a method for arranging pages and content elements in a three-dimensional (3D) space and projecting a portion of the 3D space onto a 2D surface (referred to herein as the “viewing surface”) positioned in the 3D space. A plane is designated in the 3D space referred to herein as the “base plane”. Visual content consisting of a page and at least one other page or a content element is positioned in the 3D space with at least one page positioned in the base plane. A virtual viewpoint and a viewing ray having a vertex at the viewpoint are selected from which to view a portion of the 3D space, including a portion of the base plane. In accordance with this aspect of the invention, the viewing ray is not parallel or perpendicular to the base plane. Once the viewing ray has been selected, the viewing surface is positioned in the 3D space so that it intersects the viewing ray at a predetermined distance from the viewpoint. The viewing surface is preferably planar and is preferably positioned perpendicular to the viewing ray. In this case, since the viewing ray is neither parallel nor perpendicular to the base plane, the viewing surface is also neither parallel nor perpendicular to the base plane. The viewing surface, however, may have any shape such as a portion of a spherical surface or a portion of a cylindrical surface. The viewpoint and viewing surface define a pyramid consisting of the set of rays having the viewpoint as vertex and passing through a point on the edge of the viewing surface. The portion of the 3D space located in the frustum of the pyramid determined by the viewing surface (referred to herein as the “viewing space”) is perceptively projected onto the viewing surface.
In a preferred embodiment, the projection of the 3D space on the viewing surface is displayed on a display device such as a computer screen, television or a head mounted display for stereo viewing. Alternatively, the projection of the viewing surface may be projected onto a second 2D surface and this projection displayed on a display device. A user selects the viewpoint and view ray using a computer input device such as a computer mouse, keyboard, joystick, or remote control.
The pages positioned in the base plane are preferably spaced apart from one another so that a portion of the base plane is visible between adjacent pages. The portion of the base plane between two adjacent pages is referred to as “white space”. The presence of white space between pages allows a page's content elements to be repositioned, at least partially, in the white space without obscuring other pages. In a preferred embodiment, a page's content elements are repositioned while preserving the page's layout. A repostioning of a page's content elements that preserves the page's layout is one satisfying the following conditions:
For example, if the layout specifies that a particular content element is positioned at the top of the page, that content element may be moved in the base plane in the z direction into the white space above the page's top so that it remains above the page's other content elements, but separated from them by a greater distance than previously. As another example, if the layout specifies that a first content element is to be positioned to the left of a second content element, the first content element may be moved in the base plane into the white space to the left of the page's left side so that it remains to the left of the second content element, but separated from it at a greater distance than previously. As yet another example of repositioning a page's content elements while preserving the page's layout, one or more of the content elements may be lifted above the base plane in the 3D space. As still another example, if the layout specifies that a particular content element is located in the lower right corner, the content element may be repositioned in the white space below and to the right of the page. Rotating a content element in the page (without translating it) also preserves the layout as does rotating a content element out of the base plane so that it projects into the 3D space at an angle from the base plane.
Additional content elements may also be positioned in the white space between pages. For example, the white space may be used for advertising. In this way the advertising does not compete for space with page content elements. Newly created or familiar character figures can also be positioned in the white space and used as accessories to act as guides, advertising spokesmen, or as a teaching tool. As the user approaches, the character's behavior may increase in complexity. The white space may also be used to receive information and to display it near a document asynchronously of the document, while not disturbing the document's contents or its layout.
A wide-browsing mode is created by placing a plurality of pages in the base plane with the pages preferably all positioned with the same orientation and at a predetermined separation between documents. Neighboring pages in the array of pages may be, for example, consecutive pages in a document. This creates empty space between the pages that may be utilized, for example, for auxiliary additional content resources, such as advertising, which can be positioned around a page or above it, possibly in 3D, and without competing for space with the page's own contents. The auxiliary resources may be hidden within a page or stream asynchronously from an independent source to a designated location in the 3D space.
In addition to the base plane, one or more additional planes may be designated in the 3D space parallel to the base plane so that the viewing ray intersects all of the planes. Content elements or pages are positioned in the planes, and the user may alternate his browsing between the planes as desired;
In its second aspect, the invention provides a method for navigating through the displayed visual content. Using a computer input device, the user may change the viewpoint and view ray. The perspective may be changed continuously (for example 20 to 30 times per second). Continuously changing the perspective creates an effect of smooth gliding through the 3D space over the base plane. Placing related pages side by side allows a user to view a complete document in one window by gliding from one page to the next. The user may zoom into a page for closer inspection, or zoom out from a page. Content elements or pages positioned in the 3D space may be stored in a memory together with their locations in the 3D space, transmitted to a remote location.
The base plane can be made virtually infinite by continuously generating in real time new coordinates in the base plane as the viewer brings different portions of the 3D space into view, and by positioning additional content elements in the base plane as new regions come into view.
Interactivity may be enhanced by content elements that perform a response when the viewpoint or the viewing ray satisfies a predetermined condition. The response may be initiated by passing by a particular content element, approaching a content element, withdrawing from it, or lingering near it for more than a predetermined amount of time.
In its third aspect, the invention provides a system for carrying out the method of the invention. The system consists of a computer processing unit (CPU). The CPU is configured to run a software that executes steps of positioning visual content in a virtual 3D space and projecting the 3D space onto a 2D viewing surface positioned in the 3D space, in accordance with the method of the invention. The software includes a view window of the virtual 3D space including the base plane. Initially, the 3D space contains only an empty base plane that is uniformly colored with a neutral color such as white. The software preferably has perspective correction capabilities and preferably lighting simulation capabilities (for example as provided by standard libraries such as DirectX, OpenGL etc.) and optionally, also has dithering and bilinear or trilinear filtering capabilities. The CPU may also be configured to run a software that includes the native parsing and rendering engine of the document to be viewed (such as a web browser that parses and renders HTML documents).
The system preferably includes a computer input device, such as a computer mouse, keyboard, joystick, or remote control, for selecting a view ray. The system may optionally include a display device for displaying the viewing surface such as a computer monitor, television, or set-up box. The CPU may optionally be configured to display the viewing surface on the display device.
The system may respond to the position or direction of movement of the user, his proximity to an element, actual time spent near it, or the number of times an element is approached. For example, a displayed content element that is stationary when viewed from a distance may be animated as the user approaches. The programming does not have to be downloaded from the server at this point, is preferably intrinsic to the character itself. As another example, if the user moves the viewpoint to within a predetermined distance from a content element or the perspective is directed towards an element, the time the user spends in close inspection of the object may be determined and stored in a memory. These actions may be initiated without the user to performing any action such as clicking on the element.
In yet another aspect of the invention, the invention provides a method for repositioning content elements of a page in a virtual 3D space. In accordance with this aspect of the invention, a page's content elements are repositioned while preserving the page's layout. For example, if the layout specifies that a particular content element is positioned at the top of the page, that content element may be moved in the plane of the page into a region of the plane above the page's top so that it remains above the page's other content elements, but separated from them by a greater distance than previously. As another example, if the layout specifies that a first content element is to be positioned to the left of a second content element, the first content element may be moved into a region of the plane to the left of the page's left side so that it remains to the left of the second content element, but separated from them it a greater distance than previously. As yet another example of repositioning a page's content elements while preserving the page's layout, one or more of the content elements may be lifted above the plane in the 3D space. Some of a page's content elements may be rotated from their original orientation in which they lie in the plane so that they project from the plane into the 3D space, at an angle to the plane.
In one embodiment of the invention, the base plane is internally sub-sectioned into areas, each of which is to contain a document page. The software executes the following steps:
The client viewer mechanism may also have polygonal mesh 3D model simulation capabilities, in which case the base plane and any surface above that plane is actually a flat mesh in 3D space.
In order to understand the invention and to see how it may be carried out in practice, a preferred embodiment will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:
As shown in
Once the pages and content elements have been positioned in the 3D space, a virtual viewpoint 15 and a viewing ray 85 extending from the viewpoint 15 are selected in the 3D space. The view ray 85 determines the perspective from which the 3D space is to be viewed. The view ray 85 is parallel to the 3D space z-y plane and is preferably selected so that the tops of the pages 75 are located further away from the viewpoint 15 than the bottoms. Pages oriented in the base plane in this way are said to be “aligned to z”.
A viewing surface 10 is then positioned in the 3D space perpendicular to the viewing ray 85 and at a predetermined distance from the view viewpoint 15 surface. As shown in
In accordance with this aspect of the invention, the view ray 85 and the base plane 60 are neither parallel nor perpendicular to each other. The view ray 85 thus intersects the base plane 60 at an angle 0°<α<90°.
The view ray 85 and the viewing surface 10 define a projection of the viewing space onto the viewing surface, referred to as “the perspective projection determined by the viewing ray and the viewing surface”. Under this perspective projection, a point P in the viewing space is projected onto a point P′ on the viewing surface 10 so that the points P, P′ and the viewpoint 15 are collinear. Since the view angle 0°<α90°, a rectangular page aligned to z will have a trapezoidal projection on the viewing surface 10 with a top and a bottom parallel to the x-axis of the 2D surface. The projection of the viewing space 35 on the viewing surface 15 may be displayed on a display device such as a computer monitor, television, or set-up box. Changing the view ray 85 changes the viewing space 35. The view ray may be made to change continuously so as to give the user a feeling of gliding in the 3D space.
Document layout instructions and formatting tags are rasterized with the document and elements. There is no need to return to the script form of the document for re-interpretation. The system re-rasterizes automatically tens of times per second from a single interpretation of the document. For example, on zoom and tilt, which are continuous, there is no need to return to the document.
For scripting languages, tags may correspond to null transformations, e.g. comments, which do not affect the appearance or arrangement of the document information, and which have no effect on the final result, and are not manipulated by the compiler. Tags are generally meta-information interpreted by the document's native software. The fact that script languages can contain null transformations enables interpretation by secondary languages, such as the present invention. This feature is not needed for the complete pages involved with prior art, but once a page has been broken up in accordance with the present invention, tagging may be used for the repositioning of layout elements, by using the parsing of the layout instructions in the original document. For example, tags may be used to specify that a particular layout element should be rotated, and thereby projected up out of the plane of the page. Thus a tag may be a null transformation for a native renderer, but may be an actual transformation for a secondary renderer. Software tags themselves are well known in the art for use with 2D documents. Tags, however, have not been used for information relative to the inventive cluster of layout elements for use in 3D documents, such as the inventive dimensional breakup, and behavioral scripts. Tags may be used to incorporate additional resources that are invisible to the 2D page.
Interactivity may be enhanced by introducing accessories capable of performing a response when a predetermined condition is satisfied. For example, as shown in
It will also be understood that the system according to the invention may be a suitably programmed computer. Likewise, the invention contemplates a computer program being readable by a computer for executing the method of the invention. The invention further contemplates a machine-readable memory tangibly embodying a program of instructions executable by the machine for executing the method of the invention. The invention further contemplates a computer readable medium encoded with a computer program comprising computer program code means for performing all the steps of claim 1 when said program is run on a computer. The invention further contemplates a computer readable medium encoded with a computer program, wherein said computer program code means comprises a plurality of computer instructions executable by the computer.
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|U.S. Classification||345/419, 345/473, 715/757, 345/420|
|International Classification||G06T15/00, G06T17/00, G06T11/20, G06T15/20, G06T15/40|
|Cooperative Classification||G06T11/60, G06T11/206, G06T17/00, G06T15/20, G06T2200/24, G06Q30/0241, G06T15/205|
|European Classification||G06T11/20T, G06T17/00, G06T11/60, G06T15/20|